Test: Light, Shadows And Reflections - 1

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QUESTION: 1

Which one is a transparent object?

A.

Stone

B.

Reading glass

C.

Dense fog

D.

Wax paper

Solution:

Transparent objects: If we are able to see anything clearly through an object, then such an object is said to be a transparent object. A medium that allows all the light incident on it to pass through it is called a transparent medium. Examples of transparent objects are plain glass, a reading glass, a plastic scale, window panes, a soap bubble and pure water.

QUESTION: 2

____________ help us to see the objects.

A.

Reflection

B.

Light

C.

Opaque objects

D.

Transparent objects

Solution:

Light, electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 X 10−11 metre to radio waves measured in metres. Within that broad spectrum the wavelengths visible to humans occupy a very narrow band, from about 700 nanometres (nm; billionths of a metre) for red light down to about 400 nm for violet light. The spectral regions adjacent to the visible band are often referred to as light also, infrared at the one end and ultraviolet at the other. The speed of light in a vacuum is a fundamental physical constant, the currently accepted value of which is exactly 299,792,458 metres per second, or about 186,282 miles per second.

QUESTION: 3

Light is a form of

A.

Length

B.

Energy

C.

Mass

D.

Power

Solution:
Light is a form of energy. As it gives sunlight which is a form of energy.

QUESTION: 4

To see a shadow we need

A.

A source of light and translucent object

B.

A source of light and transparent object

C.

A source of light and an opaque object

D.

Many source of light and opaque object

Solution:

A shadow is formed only when a source of light is obstructed by an opaque object.

QUESTION: 5

Which of the following will not form circular shadow

A.

Shoe box

B.

A ball

C.

A circular disk

D.

Ice-cream cone

Solution:

Shoe box will not form a circular shadow as it is rectangular in shape.

QUESTION: 6

Which of the following absorbs light the most?

A.

A mirror

B.

A piece of white paper

C.

A black wallet

D.

A green leaf

Solution:

A black wallet absorbs most of the light.

QUESTION: 7

In the morning, when the sun rises in the east, your shadow will be seen on the

A.

North

B.

West

C.

South

D.

East

Solution:

In the morning, when the sun rises in the east, your shadow will be seen on the west, i.e. on the opposite side.